<template>
    <div>
        <!-- 头部面包屑区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>角色管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
        <!-- 添加角色按钮 -->
        <el-row>
            <el-col>
                <el-button type="primary">添加角色</el-button>
            </el-col>
        </el-row>
        <!-- 角色列表区域 -->
        <el-table :data="rolesList" border stripe> 
            <!-- 展开列 -->
            <el-table-column type="expand">
                <template slot-scope="scope">
                    <el-row v-for="(item1, i1) in scope.row.children" :key="item1.id" :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']">
                        <!-- 一级权限 -->
                        <el-col :span="5">
                            <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                            <i class="el-icon-caret-right"></i>
                        </el-col>
                        <!-- 二级和三级权限 -->
                        <el-col :span="19">
                            <!-- 通过for循环 嵌套二级权限 -->
                            <el-row v-for="(item2, i2) in item1.children" :key="item2.id" :class="[i2 === '0' ? '' : 'bdtop', 'vcenter']">
                                <el-col :span="6">
                                    <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                                    <i class="el-icon-caret-right"></i>
                                </el-col>
                                <!-- 三级权限 -->
                                <el-col :span="18">
                                    <el-tag v-for="(item3) in item2.children" :key="item3.id" type="wraning" closable @close="removeRightById(scope.row,item3.id)">{{item3.authName}}</el-tag>
                                </el-col>
                            </el-row>
                        </el-col>
                    </el-row>
                </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="角色名称" prop="roleName"></el-table-column>
            <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
            <el-table-column label="操作" width="300px">
                <template slot-scope="scope">
                    <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                    <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                    <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">角色分配</el-button>
                </template>
            </el-table-column>
        </el-table>
    </el-card>
    <!-- 分配权限对话框 -->
    <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
     <!-- 树形控件 -->
        <el-tree :data="rightsList" :props="treeProps" show-checkbox node-key="id" :default-expand-all = "true" :default-checked-keys="defKeys" ref="treeRef">
        </el-tree>
        <span slot="footer" class="dialog-footer">
            <el-button @click="setRightDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="allotRights">确 定</el-button>
        </span>
</el-dialog>
    </div>
</template>
<script>
export default {
    data: function() {
        return {
            rolesList:[],
            setRightDialogVisible: false,
            rightsList: [],
            treeProps: {
                // 绑定数据源的数据对象
                label: 'authName',
                children: 'children'
            },
            defKeys: [],
            // 即将分配的角色id
            roleId: ''
        }
    },
    created: function(){
        this.getRolesList()
    },
    methods: {
        // 渲染角色列表
        getRolesList: async function() {
            const {data:res} = await this.$http.get('roles')
            if(res.meta.status !== 200) {
                return this.$message.error('角色列表获取失败');
            }
            this.rolesList = res.data;
            console.log(this.rolesList);
        },
        // 根据id删除对应的权限
        removeRightById: async function(role, rightId) {
            const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        if(confirmResult !== 'confirm') {
            return this.$message.info('取消删除该权限')
        }
        const {data: res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
        if(res.meta.status !== 200) {
            return this.$message.error('请求删除角色权限失败！')
        }
        // this.getRolesList()
        // 直接将获取的数据赋值给角色对应的权限而不是重新渲染角色列表，此时可以避免出现每次删除权限后展开行直接合上，体验效果更好
        role.children = res.data
        },
        // 展示分配权限对话框
        showSetRightDialog: async function(role) {
            this.roleId = role.id
            const {data: res} = await this.$http.get('rights/tree')
            if(res.meta.status !== 200) {
                return this.$message.error('获取权限数据失败')
            }
            this.rightsList = res.data
            console.log(this.rightsList)
            // 递归获取三级节点的id
            this.getLeafKeys(role, this.defKeys)
            this.setRightDialogVisible = true
        },
        // 通过递归的形式，获取角色下所有三级权限的id，并保存到defKeys数组中
        getLeafKeys: function(node, arr) {
            if(!node.children) {
                // 如果当前节点不包含children属性，这说明它是三级节点
                return arr.push(node.id)
            }
            node.children.forEach(item => {
                this.getLeafKeys(item, arr)
            });
        },
        // 监听分配权限对话框的关闭事件
        setRightDialogClosed: function() {
            this.defKeys = []
        },
        // 点击确定按钮进行权限分配
        allotRights: async function() {
            // ... 展开运算符，将两个数组合并成一个数组
            const keys = [...this.$refs.treeRef.getCheckedKeys(), ...this.$refs.treeRef.getHalfCheckedKeys()]
            // 将通过以,分隔的数组转换成字符串
            const idStr = keys.join(',')
            const {data: res} = await this.$http.post(`roles/${this.roleId}/rights`, {rids: idStr})
            if(res.meta.status !== 200) {
                return this.$message.error('分配权限失败')
            }
            // console.log(idStr)
            this.$message.success('分配权限成功')
            // 重新刷新列表
            this.getRolesList()
            this.setRightDialogVisible = false
        },
    }
}
</script>
<style lang="less" scoped>
    .el-tag {
        margin: 8px;
    }
    .bdtop {
        border-top: 1px solid #eee;
    }
    .bdbottom {
        border-bottom: 1px solid #eee;
    }
    .vcenter {
        display: flex;
        align-items: center;
    }
</style>